Sofa



FIG. 1 is a perspective view for a sofa of my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Dashed lines indicate stitching that is not claimed as part of my design. 

CLAIM I claim the ornamental design for a sofa, as shown and described. 